River Nidd

I would like to fish the river Nidd around the Ripley area.
I am having a few day holiday at Ripley Caravan Park in a couple of weeks and would like to fish the river within walking distance of the park - the stretch from Hampsthwaite to Nidd Viaduct.
Can anyone please help with who has the fishing on this stretch and where I can obtain a permit
Many thanks.